Docker container not picking up Rocket.toml configuration - Resolved

[BlueyNeilo]

I was trying to get Rocket running in a docker container, and followed the approach to compile from the rust tooling image FROM rust:1.40 as builder and then copy the executable over to a smaller image FROM debian:buster-slim COPY --from=builder ... as per rust Docker page

Problem:
I assumed that Rocket.toml would pick up configuration during cargo build, but I was confused when I didn't see my port or address change in the logs when the container was running.

Resolution:
It looks like it picks it up during runtime in the current directory.

Trick is to add the toml file in current directory before executing the rust application:
COPY Rocket.toml .